<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-2000
<PERIOD-START>                             APR-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          82,808
<SECURITIES>                                   650,889
<RECEIVABLES>                                   73,627
<ALLOWANCES>                                     2,346
<INVENTORY>                                     47,772
<CURRENT-ASSETS>                               987,875
<PP&E>                                         217,582
<DEPRECIATION>                                  99,443
<TOTAL-ASSETS>                               1,141,605
<CURRENT-LIABILITIES>                          171,461
<BONDS>                                        230,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           103
<OTHER-SE>                                     740,041
<TOTAL-LIABILITY-AND-EQUITY>                 1,141,605
<SALES>                                        192,378
<TOTAL-REVENUES>                               192,378
<CGS>                                           66,787
<TOTAL-COSTS>                                   66,787
<OTHER-EXPENSES>                                64,388
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,959
<INCOME-PRETAX>                                 70,195
<INCOME-TAX>                                    19,655
<INCOME-CONTINUING>                             50,540
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    50,540
<EPS-BASIC>                                       0.49
<EPS-DILUTED>                                     0.46